This page is not politically neutral. It groups Marxism and Fascism together, despite these being inappropriate comparisons - as Marxism is a theory of the analysis of capitalism and fascism is a reactionary political movement. A more appropriate but no less biased comparison would be equivocating communism and fascism. The page also includes an insufficient explication of the Marxist critique of war.
RECOMMENDED: Very good information on the idea of war for both humans and animal parallels can be found in the book "The Third Chimpanzee" by Jared Diamond! I highly recommend that curious persons (especially good, motivated writers) check the book's section(s?) on war out and use it to help this article. Also it is an excellent read cover to cover.
Need more info on special interest groups and the use of propaganda and influence techniques to motivate a population to accept/support a war, e.g. funding of thinktanks and controlling the editorial spin of "news". Currently no mention of social psychology, some useful references might be Walter Lippman's The World Outside and the Pictures in Our Heads, Noam Chomsky's Manufacturing Consent, Pratkanis and Aronsons' The Age of Propaganda (The Everyday Use and Abuse of Persuasion), Agner Fog's Warlike and Peaceful Societies, all of which have information about how war might be promoted to the public.
Persistent tendency to focus primarily on modern (and western) terminology and protocol when discussing elements of warfare. Little distinction between what the modern observer would call an "armed force" and the myraid alternative warrior groups which have waged war throughout the time periods referenced, and the treatment of the topic is hampered by such modernity.
Most violent conflicts today are regarded as 'irregular warfare', 'unconventional warfare', 'proxy wars', 'low intensity warfare', 'fourth-generation warfare', 'asymmetric wars', etc. The changing patterns of war need more discussion.
References are lacking, with many stand-alone comments needing evidence
Treat the environmental impact of war
The notion that war is evolutionarily rooted is controversial, and that controversy should receive more attention in the subsection "Evolutionary." I recommend referencing the recent academic anthology War, Peace, and Human Nature, which I think is a strong source.